---
name: "slctes.f"
section: "3"
platform: "linux"
package: "lapack-doc"
version: "3.12.1-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/slctes.f"
---

# slctes.f(3)

## NAME

TESTING/EIG/slctes.f

## SYNOPSIS

### Functions/Subroutines

logical function **slctes** (zr, zi, d)\
 **SLCTES**

## Function/Subroutine Documentation

### logical function slctes (real zr, real zi, real d)

**SLCTES**

**Purpose:**

```
!>
!> SLCTES returns .TRUE. if the eigenvalue (ZR/D) + sqrt(-1)*(ZI/D)
!> is to be selected (specifically, in this subroutine, if the real
!> part of the eigenvalue is negative), and otherwise it returns
!> .FALSE..
!>
!> It is used by the test routine SDRGES to test whether the driver
!> routine SGGES successfully sorts eigenvalues.
!>
```

**Parameters**

*ZR*

```
!>          ZR is REAL
!>          The numerator of the real part of a complex eigenvalue
!>          (ZR/D) + i*(ZI/D).
!>
```

*ZI*

```
!>          ZI is REAL
!>          The numerator of the imaginary part of a complex eigenvalue
!>          (ZR/D) + i*(ZI).
!>
```

*D*

```
!>          D is REAL
!>          The denominator part of a complex eigenvalue
!>          (ZR/D) + i*(ZI/D).
!>
```

**Author**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line **67** of file **slctes.f**.

## Author

Generated automatically by Doxygen for LAPACK from the source code.